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Grade 6 · Math · Unit 3 of 13

Factors & Primes

Divisibility and prime factors

What your child practises

Using divisibility rules for 2, 3, 4, 5, 6, 8, 9 and 10, telling prime from composite, and writing a number as a product of prime factors.

Alberta Curriculum learning outcome: 6N3.1 · divisibility, prime and composite numbers and prime factorization

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    Which number is divisible by 8?

    • 185
    • 97
    • 880
    Show answer

    880

    Hint: Use the divisibility rule for 8.

  2. Question 2

    Which shows 45 as a product of prime factors?

    • 3 × 3 × 5
    • 9 × 5
    • 3 × 3 × 2
    Show answer

    3 × 3 × 5

    Hint: Prime factors are all prime numbers. Check that the product equals the number.

  3. Question 3

    A number is divisible by 9 when…

    • its digits are all odd
    • the sum of its digits is divisible by 9
    • its last digit is 9
    Show answer

    the sum of its digits is divisible by 9

    Hint: Add the digits. If the total is in the 9 times table, the number is too.

  4. Question 4

    Is 871 divisible by 3?

    • Yes
    • No
    Show answer

    No

    Hint: Check the rule for 3.

  5. Question 5

    Which shows 63 as a product of prime factors?

    • 3 × 3 × 2
    • 3 × 3 × 7
    • 9 × 7
    Show answer

    3 × 3 × 7

    Hint: Prime factors are all prime numbers. Check that the product equals the number.

  6. Question 6

    Which number is divisible by 4?

    • 470
    • 759
    • 184
    Show answer

    184

    Hint: Use the divisibility rule for 4.

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